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Python Network Programming Cookbook

Python Network Programming Cookbook

By : Pradeeban Kathiravelu, Gary Berger, Dr. M. O. Faruque Sarker
3.5 (4)
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Python Network Programming Cookbook

Python Network Programming Cookbook

3.5 (4)
By: Pradeeban Kathiravelu, Gary Berger, Dr. M. O. Faruque Sarker

Overview of this book

Python Network Programming Cookbook - Second Edition highlights the major aspects of network programming in Python, starting from writing simple networking clients to developing and deploying complex Software-Defined Networking (SDN) and Network Functions Virtualization (NFV) systems. It creates the building blocks for many practical web and networking applications that rely on various networking protocols. It presents the power and beauty of Python to solve numerous real-world tasks in the area of network programming, network and system administration, network monitoring, and web-application development. In this edition, you will also be introduced to network modelling to build your own cloud network. You will learn about the concepts and fundamentals of SDN and then extend your network with Mininet. Next, you’ll find recipes on Authentication, Authorization, and Accounting (AAA) and open and proprietary SDN approaches and frameworks. You will also learn to configure the Linux Foundation networking ecosystem and deploy and automate your networks with Python in the cloud and the Internet scale. By the end of this book, you will be able to analyze your network security vulnerabilities using advanced network packet capture and analysis techniques.
Table of Contents (15 chapters)
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Converting an IPv4 address to different formats

When you would like to deal with low-level network functions, sometimes, the usual string notation of IP addresses are not very useful. They need to be converted to the packed 32-bit binary formats.

How to do it...

The Python socket library has utilities to deal with the various IP address formats. Here, we will use two of them: inet_aton() and inet_ntoa().

Let us create the convert_ip4_address() function, where inet_aton() and inet_ntoa() will be used for the IP address conversion. We will use two sample IP addresses, 127.0.0.1 and 192.168.0.1.

Listing 1.3 shows ip4_address_conversion as follows:

#!/usr/bin/env python
# Python Network Programming Cookbook,
Second Edition -- Chapter - 1 # This program is optimized for Python 2.7.12 and
Python 3.5.2. # It may run on any other version with/without
modifications. import socket from binascii import hexlify def convert_ip4_address(): for ip_addr in ['127.0.0.1', '192.168.0.1']: packed_ip_addr = socket.
inet_aton(ip_addr) unpacked_ip_addr = socket.inet_ntoa
(packed_ip_addr) print ("IP Address: %s => Packed: %s,
Unpacked: %s" %(ip_addr,
hexlify(packed_ip_addr),
unpacked_ip_addr)) if __name__ == '__main__': convert_ip4_address()

Now, if you run this recipe, you will see the following output:

$ python 1_3_ip4_address_conversion.py 
IP Address: 127.0.0.1 => Packed: 7f000001, Unpacked: 
127.0.0.1
IP Address: 192.168.0.1 => Packed: c0a80001, Unpacked: 192.168.0.1

How it works...

In this recipe, the two IP addresses have been converted from a string to a 32-bit packed format using a for-in statement. Additionally, the Python hexlify function is called from the binascii module. This helps to represent the binary data in a hexadecimal format.

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